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A comparative study of indentation induced creep in pure magnesium and AZ61 alloy

机译：纯镁与AZ61合金压痕蠕变的比较研究

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摘要

Nanoindentation creep tests were performed on pure Mg and Mg-6 wt% Al-1 wt% Zn (AZ61) alloy at room temperature. Plastic flow and creep were more pronounced in Mg than in A261. Pure Mg was found to exhibit two distinct steady state stress regimes, with the values of stress exponent equal to 4.5 and 12. Twinning is most likely to dominate initially, in the high stress regime. Crystallographic re-orientation, caused by twinning renders the grains favorable for slip in low stress regime. Grain boundary creep was also investigated, and appeared to be related to grain boundary sliding (n=2) in low stress regime. Creep response of AZ61 consisted of a single stress exponent regime (n～1) for both grain interior as well as grain boundary. A combination of extension and contraction twinning seems to be the dominant deformation mechanism. Chemical potential gradient induced diffusion is also likely to play an important role in creep deformation.
机译：在室温下对纯Mg和Mg-6 wt％Al-1 wt％Zn（AZ61）合金进行了纳米压痕蠕变测试。镁的塑性流动和蠕变比A261更为明显。发现纯Mg表现出两种不同的稳态应力状态，应力指数的值分别为4.5和12。在高应力状态下，孪晶最有可能占主导地位。由孪晶引起的晶体学重新取向使得晶粒在低应力状态下有利于滑移。还研究了晶界蠕变，它与低应力状态下的晶界滑动（n = 2）有关。 AZ61的蠕变响应由晶粒内部和晶界的单一应力指数范围（n〜1）组成。伸展和收缩孪生的组合似乎是主要的变形机制。化学势梯度引起的扩散也可能在蠕变变形中起重要作用。

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  • 来源
    《Materials Science and Engineering》 |2015年第10期|131-138|共8页
  • 作者

    Pranjal Nautiyal; Jayant Jain; Arvind Agarwal;

  • 作者单位

    Discipline of Mechanical Engineering, Indian Institute of Information Technology, Design & Manufacturing, Jabalpur, Madhya Pradesh 482005, India,Department of Applied Mechanics, Indian Institute of Technology, Delhi 110016, India;

    Department of Applied Mechanics, Indian Institute of Technology, Delhi 110016, India;

    Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Creep; Nanoindentation; Mg; AZ61; Stress exponent;

    机译：蠕变;纳米压痕镁;AZ61;压力指数;

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